drm/msm/dpu: use PINGPONG_NONE for LMs with no PP attached

On msm8998/sdm845 some LM blocks do not have corresponding PINGPONG
block. Currently the driver uses PINGPONG_MAX for such cases. Switch
that to use PINGPONG_NONE instead, which is more logical.
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/538205/
Link: https://lore.kernel.org/r/20230519234025.2864377-4-dmitry.baryshkov@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_3_0_msm8998.h

@@ -104,9 +104,9 @@ static const struct dpu_lm_cfg msm8998_lm[] = {
 	LM_BLK("lm_2", LM_2, 0x46000, MIXER_MSM8998_MASK,
 		&msm8998_lm_sblk, PINGPONG_2, LM_5, 0),
 	LM_BLK("lm_3", LM_3, 0x47000, MIXER_MSM8998_MASK,
-		&msm8998_lm_sblk, PINGPONG_MAX, 0, 0),
+		&msm8998_lm_sblk, PINGPONG_NONE, 0, 0),
 	LM_BLK("lm_4", LM_4, 0x48000, MIXER_MSM8998_MASK,
-		&msm8998_lm_sblk, PINGPONG_MAX, 0, 0),
+		&msm8998_lm_sblk, PINGPONG_NONE, 0, 0),
 	LM_BLK("lm_5", LM_5, 0x49000, MIXER_MSM8998_MASK,
 		&msm8998_lm_sblk, PINGPONG_3, LM_2, 0),
 };

drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_4_0_sdm845.h

@@ -102,9 +102,9 @@ static const struct dpu_lm_cfg sdm845_lm[] = {
 	LM_BLK("lm_2", LM_2, 0x46000, MIXER_SDM845_MASK,
 		&sdm845_lm_sblk, PINGPONG_2, LM_5, 0),
 	LM_BLK("lm_3", LM_3, 0x0, MIXER_SDM845_MASK,
-		&sdm845_lm_sblk, PINGPONG_MAX, 0, 0),
+		&sdm845_lm_sblk, PINGPONG_NONE, 0, 0),
 	LM_BLK("lm_4", LM_4, 0x0, MIXER_SDM845_MASK,
-		&sdm845_lm_sblk, PINGPONG_MAX, 0, 0),
+		&sdm845_lm_sblk, PINGPONG_NONE, 0, 0),
 	LM_BLK("lm_5", LM_5, 0x49000, MIXER_SDM845_MASK,
 		&sdm845_lm_sblk, PINGPONG_3, LM_2, 0),
 };

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h

@@ -529,7 +529,7 @@ struct dpu_sspp_cfg {
  * @base               register offset of this block
  * @features           bit mask identifying sub-blocks/features
  * @sblk:              LM Sub-blocks information
- * @pingpong:          ID of connected PingPong, PINGPONG_MAX if unsupported
+ * @pingpong:          ID of connected PingPong, PINGPONG_NONE if unsupported
  * @lm_pair_mask:      Bitmask of LMs that can be controlled by same CTL
  */
 struct dpu_lm_cfg {

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h

@@ -191,7 +191,8 @@ enum dpu_dsc {
 };
 
 enum dpu_pingpong {
-	PINGPONG_0 = 1,
+	PINGPONG_NONE,
+	PINGPONG_0,
 	PINGPONG_1,
 	PINGPONG_2,
 	PINGPONG_3,

drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c

@@ -117,7 +117,7 @@ int dpu_rm_init(struct dpu_rm *rm,
 		struct dpu_hw_mixer *hw;
 		const struct dpu_lm_cfg *lm = &cat->mixer[i];
 
-		if (lm->pingpong == PINGPONG_MAX) {
+		if (lm->pingpong == PINGPONG_NONE) {
 			DPU_DEBUG("skip mixer %d without pingpong\n", lm->id);
 			continue;
 		}